Buggy code:
public class Hierarchy { private Map < SootClass , List < SootClass > > classToSubclasses ; private Map < SootClass , List < SootClass > > interfaceToSubinterfaces ; private Map < SootClass , List < SootClass > > interfaceToSuperinterfaces ; private Map < SootClass , List < SootClass > > classToDirSubclasses ; private Map < SootClass , List < SootClass > > interfaceToDirSubinterfaces ; private Map < SootClass , List < SootClass > > interfaceToDirSuperinterfaces ; private Map < SootClass , List < SootClass > > interfaceToDirImplementers ; int state ; Scene sc ; public Hierarchy ( ) { } private void checkState ( ) { } public List < SootClass > getSubclassesOfIncluding ( SootClass c ) { } public List < SootClass > getSubclassesOf ( SootClass c ) { } public List < SootClass > getSuperclassesOfIncluding ( SootClass c ) { } public List < SootClass > getSuperclassesOf ( SootClass c ) { } public List < SootClass > getSubinterfacesOfIncluding ( SootClass c ) { } public List < SootClass > getSubinterfacesOf ( SootClass c ) { } public List < SootClass > getSuperinterfacesOfIncluding ( SootClass c ) { } public List < SootClass > getSuperinterfacesOf ( SootClass c ) { } public List < SootClass > getDirectSuperclassesOf ( SootClass c ) { } public List < SootClass > getDirectSubclassesOf ( SootClass c ) { } public List < SootClass > getDirectSubclassesOfIncluding ( SootClass c ) { } public List < SootClass > getDirectSuperinterfacesOf ( SootClass c ) { } public List < SootClass > getDirectSubinterfacesOf ( SootClass c ) { } public List < SootClass > getDirectSubinterfacesOfIncluding ( SootClass c ) { } public List < SootClass > getDirectImplementersOf ( SootClass i ) { } public List < SootClass > getImplementersOf ( SootClass i ) { } public boolean isClassSubclassOf ( SootClass child , SootClass possibleParent ) { } public boolean isClassSubclassOfIncluding ( SootClass child , SootClass possibleParent ) { } public boolean isClassDirectSubclassOf ( SootClass c , SootClass c2 ) { } public boolean isClassSuperclassOf ( SootClass parent , SootClass possibleChild ) { } public boolean isClassSuperclassOfIncluding ( SootClass parent , SootClass possibleChild ) { } public boolean isInterfaceSubinterfaceOf ( SootClass child , SootClass possibleParent ) { } public boolean isInterfaceDirectSubinterfaceOf ( SootClass child , SootClass possibleParent ) { } public boolean isInterfaceSuperinterfaceOf ( SootClass parent , SootClass possibleChild ) { } public boolean isInterfaceDirectSuperinterfaceOf ( SootClass parent , SootClass possibleChild ) { } public SootClass getLeastCommonSuperclassOf ( SootClass c1 , SootClass c2 ) { } public boolean isVisible ( SootClass from , SootClass check ) { } public boolean isVisible ( SootClass from , ClassMember m ) { } public SootMethod resolveConcreteDispatch ( SootClass concreteType , SootMethod m ) { concreteType . checkLevel ( HIERARCHY ) ; m . getDeclaringClass ( ) . checkLevel ( HIERARCHY ) ; checkState ( ) ; if ( concreteType . isInterface ( ) ) throw new RuntimeException ( "class<seq2seq4repair_space>needed!" ) ; String methodSig = m . getSubSignature ( ) ; for ( SootClass c : getSuperclassesOfIncluding ( concreteType ) ) { SootMethod sm = c . getMethodUnsafe ( methodSig ) ; <START_BUG> if ( ( sm != null ) && ( isVisible ( c , m ) ) ) { <END_BUG> return sm ; } } throw new RuntimeException ( ( ( ( "could<seq2seq4repair_space>not<seq2seq4repair_space>resolve<seq2seq4repair_space>concrete<seq2seq4repair_space>dispatch!\nType:<seq2seq4repair_space>" + concreteType ) + "\nMethod:<seq2seq4repair_space>" ) + m ) ) ; } public List < SootMethod > resolveConcreteDispatch ( List < Type > classes , SootMethod m ) { } public List < SootMethod > resolveAbstractDispatch ( SootClass c , SootMethod m ) { } public List < SootMethod > resolveAbstractDispatch ( List < SootClass > classes , SootMethod m ) { } public SootMethod resolveSpecialDispatch ( SpecialInvokeExpr ie , SootMethod container ) { } }

Fix:
if ( ( sm != null ) && ( ( m . getDeclaringClass ( ) . isInterface ( ) ) || ( isVisible ( c , m ) ) ) ) {